Update versions for spring framework boot and springdoc

Update spring framework boot version to 2.6.7.
Update springdoc version to 1.6.8.

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>2.6.6</version>
+    <version>2.6.7</version>
     <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>org.openepics</groupId>
@@ -69,7 +69,7 @@
     <dependency>
       <groupId>org.springdoc</groupId>
       <artifactId>springdoc-openapi-ui</artifactId>
-      <version>1.6.7</version>
+      <version>1.6.8</version>
     </dependency>
 
     <dependency>